I finally located the Howard Thurman poem that Jim Strathdee’s 1969 “I Am the Light of the World” is based on.
The Work of Christmas
When the song of the angels is stilled,
When the star in the sky is gone,
When the kings and princes are home,
When the shepherds are back with their flock,
The work of Christmas begins:
To find the lost,
To heal the broken,
To feed the hungry,
To release the prisoner,
To rebuild the nations,
To bring peace among brothers,
To make music in the heart.
Hope somebody somewhere sings Strathdee this Advent, or reads Thurman’s litany.
Presumably it is technically under copyright, but I can’t find the original date (obviously pre-1969). It is in Thurman’s The Mood of Christmas, which is © 1973 by Howard Thurman, but doesn’t give the history.